DOI: 10.1029/2019JB017801
论文题名: Modeling the Posteruptive Deformation at Okmok Based on the GPS and InSAR Time Series: Changes in the Shallow Magma Storage System
作者: Xue X. ; Freymueller J. ; Lu Z.
刊名: Journal of Geophysical Research: Solid Earth
ISSN: 21699313
出版年: 2020
卷: 125, 期: 2 语种: 英语
英文关键词: GPS and InSAR
; Okmok volcano
; Post-eruptive deformation modeling
; Time-dependent inversion
Scopus关键词: data inversion
; deformation
; GPS
; Kalman filter
; magma
; modeling
; synthetic aperture radar
; time series analysis
; volcanic eruption
; Alaska
; Aleutian Islands
; Fox Islands
; Okmok Volcano
; Umnak Island
; United States
英文摘要: Based on the unscented Kalman filter, we develop a time-dependent inversion filter combining Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) time series observations for modeling volcano deformation. We use the Variance Component Estimation method as means to assign the relative weights for GPS and InSAR data. Then we use the inversion filter to model the posteruptive deformation at Okmok volcano, Alaska. We find that a Mogi source at 3–4 km depth fits the InSAR data well, while the best fit to the GPS data is an oblate spheroid source at about 2.5 km depth. Our final model consists of a shallow sill at ~0.9 km and a Mogi source at ~3.2 km depth, which well fit both the GPS and InSAR data simultaneously. We think the Mogi source obtained here is the same source account for the preeruptive deformation. The shallow sill is a new structure that was not seen before the 2008 eruption. From 2008 to 2019, we have observed five inflation episodes, each of which decays exponential in time. We find that the characteristic timescale of those inflation episodes decreases with respect to time. The total volume change from the two sources is 0.068 km3, which recovers 50–60% of the volume decrease during the 2008 eruption. ©2020. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159655
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, United States; Roy M. Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX, United States
Recommended Citation:
Xue X.,Freymueller J.,Lu Z.. Modeling the Posteruptive Deformation at Okmok Based on the GPS and InSAR Time Series: Changes in the Shallow Magma Storage System[J]. Journal of Geophysical Research: Solid Earth,2020-01-01,125(2)